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/****************************************************************************
* net/net_checksd.c
*
* Copyright (C) 2011 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/socket.h>
#include <sched.h>
#include <errno.h>
#include <debug.h>
#include "net_internal.h"
/****************************************************************************
* Global Functions
****************************************************************************/
/****************************************************************************
* Name: net_checksd
*
* Description:
* Check if the socket descriptor is valid for the provided TCB and if it
* supports the requested access. This trivial operation is part of the
* fdopen() operation when the fdopen() is performed on a socket descriptor.
* It simply performs some sanity checking before permitting the socket
* descriptor to be wrapped as a C FILE stream.
*
****************************************************************************/
#if defined(CONFIG_NET) && CONFIG_NFILE_DESCRIPTORS > 0
int net_checksd(int sd, int oflags)
{
FAR struct socket *psock = sockfd_socket(sd);
/* Verify that the sockfd corresponds to valid, allocated socket */
if (!psock || psock->s_crefs <= 0)
{
nvdbg("No valid socket for sd: %d\n", sd);
return -EBADF;
}
/* NOTE: We permit the socket FD to be "wrapped" in a stream as
* soon as the socket descriptor is created by socket(). Therefore
* (1) we don't care if the socket is connected yet, and (2) there
* are no access restrictions that can be enforced yet.
*/
return OK;
}
#endif /* CONIG_NET && CONFIG_NFILE_DESCRIPTORS > 0 */
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